A device for fine polishing the inner wall of a nickel-titanium alloy thick tube

Abstract

The application discloses a nickel-titanium alloy rough pipe inner wall fine polishing device, which is provided with a cylindrical fixed inner liner capable of being closely sleeved on the outer side of a nickel-titanium alloy rough pipe to be polished, a sleeve with a closed bottom, and an axis cloth wheel rotating assembly capable of rotating around the axis of the sleeve, the sleeve is sleeved on the outer side of the fixed inner liner, the axis cloth wheel rotating assembly is arranged in the sleeve, the axis of the axis cloth wheel rotating assembly coincides with the axis of the sleeve, and the maximum rotating diameter of the axis cloth wheel rotating assembly is equal to the inner diameter of the nickel-titanium alloy rough pipe to be polished. The nickel-titanium alloy rough pipe inner wall fine polishing device can effectively remove the defects such as scratches, micro-cracks and pits on the inner wall of the nickel-titanium alloy rough pipe, is high in processing efficiency, and can significantly improve the surface smoothness of the product. Meanwhile, through accurate automatic control, the consistency and stability of the polishing process are ensured, and the damage of the pipe material in the polishing process is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of metal material processing technology, and in particular to a fine polishing device for the inner wall of a nickel-titanium alloy coarse tube. Background Technology

[0002] Nickel-titanium alloys, with their excellent superelasticity, shape memory effect, and biocompatibility, have become indispensable materials in many cutting-edge technology fields such as medical devices, aerospace, and artificial intelligence. Nickel-titanium alloy thick tubes are commonly used in these fields. These tubes have an inner diameter of 9mm to 100mm and a wall thickness of ≥0.1mm. Due to their unique functional characteristics, extremely high requirements are placed on the processing and manufacturing of these tubes.

[0003] In the processing of nickel-titanium alloy thick tubes, despite the precise forming and cutting processes, processing marks such as scratches, microcracks, and pits will still remain on the inner wall. These defects can increase the flow resistance of the fluid inside the tube during use, accelerate the wear of the tube, and even in some sensitive applications, such as biomedical implants, may have adverse effects on surrounding tissues, thereby threatening the performance and safety of the product.

[0004] Traditional polishing methods for the inner walls of nickel-titanium alloy coarse pipes, such as manual grinding and sandblasting, while improving the surface finish to some extent, have obvious limitations. Manual grinding is not only inefficient but also struggles to ensure uniformity and consistency in the polishing effect; while sandblasting can improve polishing efficiency, excessive sandblasting can damage the pipe surface, introducing new defects and affecting the overall performance of the pipe. Furthermore, both methods struggle to achieve precise control over the polishing depth, limiting the use of such pipes in fields such as biomedicine, aerospace, and artificial intelligence. Summary of the Invention

[0005] Therefore, it is necessary to provide a fine polishing device for the inner wall of nickel-titanium alloy coarse pipes to address the above-mentioned technical problems. This device can automatically remove defects such as scratches, microcracks, and pits from the inner wall of nickel-titanium alloy coarse pipes, improve the smoothness, and is highly efficient and does not easily damage the pipe material.

[0006] This invention provides a fine polishing device for the inner wall of a nickel-titanium alloy coarse tube. The device comprises a cylindrical fixed inner liner that can be tightly fitted onto the outside of the nickel-titanium alloy coarse tube to be polished, a sleeve with a closed bottom, and a rotating assembly of a shaft and cloth wheel that can rotate around the axis of the sleeve. The sleeve is fitted onto the outside of the fixed inner liner, and the rotating assembly of the shaft and cloth wheel is disposed inside the sleeve. The axis of the rotating assembly of the shaft and cloth wheel coincides with the axis of the sleeve, and the maximum rotation diameter of the rotating assembly of the shaft and cloth wheel is equal to the inner diameter of the nickel-titanium alloy coarse tube to be polished.

[0007] In one embodiment, the height of the fixed inner liner is equal to the length of the nickel-titanium alloy tube to be polished. The fixed inner liner includes an upper inner liner and a lower inner liner. The upper inner liner is fixedly connected to the top of the lower inner liner. The height ratio of the upper inner liner to the lower inner liner is 1:16 to 19.

[0008] The sidewall of the lower liner is provided with a plurality of first through holes evenly arranged along the axial direction. Each first through hole penetrates the sidewall of the lower liner vertically. The sidewall of the lower liner is provided with a plurality of sets of second through holes in the radial direction, the number of which is equal to the number of first through holes. Each set of second through holes includes a plurality of second through holes evenly distributed in the vertical direction. Each second through hole penetrates the sidewall of the lower liner radially. Each first through hole is connected to all the second through holes in a set of second through holes.

[0009] A grooved ring is provided in the middle of the upper inner substrate, and each first through hole communicates with the grooved ring;

[0010] The side wall of the upper liner is provided with a first air extraction hole, which is connected to the groove ring.

[0011] The sleeve is provided with a second air extraction hole in the axial direction, and the second air extraction hole is connected to the first air extraction hole.

[0012] An air pump is installed on the outside of the sleeve, and the air pump is connected to the second air extraction port.

[0013] In one embodiment, the inner wall fine polishing device of the nickel-titanium alloy coarse tube is further provided with a lifting mechanism, which is provided with an upper base plate, multiple support columns, a lower base plate, a guide rail, an upper lifting block and a lower lifting block.

[0014] The upper and lower substrates are parallel and aligned vertically, and are fixedly connected to the upper and lower ends of multiple support columns. The guide rail is vertically fixed between the upper and lower substrates.

[0015] Both the upper and lower lifting blocks are fitted onto the guide rail and can slide up and down along the guide rail.

[0016] A circular groove is provided on the top of the lower substrate, and two mounting keys are horizontally arranged inside the circular groove.

[0017] In one embodiment, the cloth wheel rotating assembly is provided with an upper spiral shaft, a lower spiral shaft, a top sealing plate, a bottom sealing plate, and a cloth wheel sleeved on the lower spiral shaft;

[0018] The upper and lower helical shafts are coaxial, and the top of the lower helical shaft is threadedly connected to the bottom of the upper helical shaft.

[0019] The top sealing plate and the bottom sealing plate are fixedly connected to both ends of the lower spiral shaft, and both the top sealing plate and the bottom sealing plate are perpendicular to the axis of the lower spiral shaft. The distance between the top sealing plate and the bottom sealing plate is equal to the length of the nickel-titanium alloy thick tube to be polished.

[0020] Both the top sealing plate and the bottom sealing plate are circular with equal radii. The top sealing plate consists of two semi-circular plates, which can be detachably assembled onto the lower spiral shaft.

[0021] The top end of the lower spiral shaft extends out after penetrating the top sealing plate, and the bottom end of the lower spiral shaft extends out after penetrating the bottom sealing plate;

[0022] The radius of the cloth wheel's shaft is equal to the radius of the top sealing plate;

[0023] The top of the cloth wheel abuts against the bottom of the top sealing plate, and the bottom abuts against the top of the bottom sealing plate.

[0024] In one embodiment, the fine polishing device for the inner wall of the nickel-titanium alloy coarse tube is further provided with a rotary motor component and a grinding auxiliary component. The rotary motor component is located above the grinding auxiliary component. The rotary motor component is fixedly connected to the upper lifting block, and the grinding auxiliary component is fixedly connected to the lower lifting block. The rotation axis of the rotary motor component coincides with the axis of the shaft cloth wheel rotation assembly. The upper spiral shaft of the shaft cloth wheel rotation assembly is fixedly connected to the rotary motor component.

[0025] The grinding auxiliary component is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the sleeve;

[0026] The bottom of the rotary motor component is provided with a circular protrusion, and the top of the grinding auxiliary component is provided with a columnar assembly cavity with a radius equal to that of the circular protrusion, and the circular protrusion is assembled in the assembly cavity.

[0027] The bottom of the grinding auxiliary component abuts against the top of the sleeve;

[0028] A rotating hole is provided at the center of the inner side of the bottom of the sleeve, and the bottom end of the lower spiral shaft of the shaft cloth wheel rotating assembly is inserted into the rotating hole;

[0029] The radius of the circular groove is equal to the radius of the sleeve. Two mounting slots are provided on the outer bottom of the sleeve, which can be matched with two mounting keys respectively. The sleeve is inserted into the circular groove.

[0030] In one embodiment, a support ring is provided inside the sleeve. The outer wall of the support ring is fixedly connected to the inner wall of the sleeve. The inner diameter of the support ring is equal to the inner diameter of the nickel-titanium alloy tube to be polished. The distance from the bottom of the support ring to the inner side of the bottom of the sleeve is greater than the height of the fixed liner.

[0031] The top of the fixed inner liner abuts against the bottom of the grinding auxiliary component, and the bottom abuts against the top of the support ring.

[0032] The beneficial effects of this invention are as follows: The shaft-cloth wheel rotating assembly of this invention fits snugly against the inner wall of the nickel-titanium alloy coarse tube to be polished. The cloth wheel is a flexible component. By rotating the shaft-cloth wheel rotating assembly, fine polishing of the inner wall of the tube is achieved, which can completely remove defects such as scratches, microcracks, and pits on the inner wall of the nickel-titanium alloy coarse tube, improving the smoothness. Moreover, this equipment can achieve automated operation, improving production efficiency. In addition, the nickel-titanium alloy coarse tube can be tightly fitted and fixed with the inner liner, which can avoid damage such as compression to the outer wall of the tube during the polishing process. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the fine polishing device for the inner wall of a nickel-titanium alloy coarse tube provided in an embodiment of the present invention.

[0034] Figure 2 This is one of the schematic diagrams of the cross-sectional structure of the fine polishing device for the inner wall of the nickel-titanium alloy coarse tube provided in the embodiments of the present invention along the axis of the first sleeve;

[0035] Figure 3 This is a schematic diagram of the fixed inner liner provided in an embodiment of the present invention;

[0036] Figure 4 This is one of the schematic cross-sectional views of the fixed inner liner along the axial direction provided in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the lifting mechanism provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the shaft cloth wheel rotating assembly provided in an embodiment of the present invention;

[0039] Figure 7 This is one of the structural schematic diagrams of the sleeve provided in the embodiments of the present invention;

[0040] Figure 8 This is a schematic diagram of another angle structure of the sleeve provided in an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached drawings: 200, fixed inner liner; 210, sleeve; 211, support ring; 212, rotating hole; 213, mounting groove; rotating hole 220, shaft cloth wheel rotating assembly; 230, rotating motor component; 240, grinding auxiliary component; 300, lifting mechanism; 310, upper base plate; 320, support column; 330, lower base plate; 340, guide rail; 350, upper lifting block; 360, lower lifting block; 370, circular groove; 380, mounting key; 400, upper inner liner; 410, lower inner liner; 420, first through hole; 430, second through hole; 440, groove ring; 450, first air extraction hole; 460, second air extraction hole; 500, upper spiral shaft; 510, lower spiral shaft; 520, top sealing plate; 530, bottom sealing plate; 540, cloth wheel. Detailed Implementation

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] It should be noted that in the description of this invention, "upper," "lower," "top," "bottom," and orientation or positional relationship are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0044] In one embodiment, such as Figure 1 and Figure 2 As shown, the fine polishing device for the inner wall of the nickel-titanium alloy coarse tube in this embodiment is provided with a cylindrical fixed inner liner 200 that can be tightly fitted onto the outside of the nickel-titanium alloy coarse tube to be polished, a sleeve 210 with a closed bottom, and a shaft and cloth wheel rotating assembly 220 that can rotate around the axis of the sleeve 210. The sleeve 210 is fitted onto the outside of the fixed inner liner 200, and the shaft and cloth wheel rotating assembly 220 is disposed inside the sleeve 210. The axis of the shaft and cloth wheel rotating assembly 220 coincides with the axis of the sleeve 210, and the maximum rotation diameter of the shaft and cloth wheel rotating assembly 220 is equal to the inner diameter of the nickel-titanium alloy coarse tube to be polished.

[0045] The shaft cloth wheel rotating assembly 220 can rotate in the fixed inner liner 200, and polish the inner wall of the nickel-titanium alloy coarse tube in combination with the polishing liquid. The polishing liquid contains polishing particles with smaller particle size. The shaft cloth wheel rotating assembly 220 plus the polishing liquid can further polish the inner wall of the nickel-titanium alloy coarse tube, remove scratches, and improve the surface smoothness of the inner wall.

[0046] In addition, the fixed inner liner 200 can be tightly fitted onto the outside of the nickel-titanium alloy thick tube to be polished, which can avoid damage to the outer wall of the tube during the polishing process.

[0047] In one embodiment, such as Figure 3 and Figure 4 As shown, the height of the fixed inner liner 200 is equal to the length of the nickel-titanium alloy thick tube to be polished. The fixed inner liner 200 includes an upper inner liner 400 and a lower inner liner 410. The upper inner liner 400 is fixedly connected to the top of the lower inner liner 410. The height ratio of the upper inner liner 400 to the lower inner liner 410 is 1:16 to 19.

[0048] In this embodiment, the height ratio of the upper inner liner 400 to the lower inner liner 410 is specifically 1:19. Both the first inner liner 100 and the fixed inner liner 200 are made of acid-resistant polymer material.

[0049] The lower liner 410 has a plurality of first through holes 420 uniformly arranged along the axial direction in the middle of the side wall. Each first through hole 420 vertically penetrates the side wall of the lower liner 410. The side wall of the lower liner 410 has a plurality of sets of second through holes 430 in the radial direction, the number of which is equal to the number of first through holes 420. Each set of second through holes 430 includes a plurality of second through holes 430 uniformly distributed in the vertical direction. Each second through hole 430 radially penetrates the side wall of the lower liner 410. Each first through hole 420 is connected to all the second through holes 430 in a set of second through holes 430.

[0050] Specifically, the diameters of the first through hole 420 and the second through hole 430 are both 0.5 to 5 mm.

[0051] A grooved ring 440 is provided in the middle of the bottom of the upper inner liner 400, and each first through hole 420 communicates with the grooved ring 440; a first air extraction hole 450 is provided on the side wall of the upper inner liner 400, and the first air extraction hole 450 communicates with the grooved ring 440. A second air extraction hole 460 is provided axially on the sleeve 210, and the second air extraction hole 460 communicates with the first air extraction hole 450; an air extraction pump is provided on the outside of the sleeve 210, and the air extraction pump communicates with the second air extraction hole 460.

[0052] In this embodiment, the first through hole 420, the second through hole 430, the groove ring 440, the first air extraction hole 450, the second air extraction hole 460, and the air pump are all connected to form an air extraction channel. When the air pump is turned on, the nickel-titanium alloy thick tube can be tightly attached to the inner wall surface of the first inner liner 100 or the fixed inner liner 200, which can avoid damage to the outer wall of the tube during the polishing process.

[0053] In one embodiment, such as Figure 5 As shown, the fine polishing device for the inner wall of the nickel-titanium alloy coarse tube is also equipped with a lifting mechanism 300. The lifting mechanism 300 is equipped with an upper base plate 310, multiple support columns 320, a lower base plate 330, a guide rail 340, an upper lifting block 350 and a lower lifting block 360.

[0054] The upper substrate 310 and lower substrate 330 are parallel and aligned vertically, fixedly connected to the upper and lower ends of multiple supporting columns 320. A guide rail 340 is vertically fixed between the upper substrate 310 and lower substrate 330. Both the upper lifting block 350 and lower lifting block 360 are sleeved on the guide rail 340 and can slide up and down along it. A circular groove 370 is provided on the top of the lower substrate 330, and two horizontal mounting keys 380 are arranged inside the circular groove 370. The depth of the circular groove 370 is half the thickness of the lower substrate 330.

[0055] Specifically, in this embodiment, the upper base plate 310 and lower base plate 330 of the lifting mechanism 300 are both rectangular metal plates, arranged horizontally. The lifting mechanism 300 has four supporting columns 320, which are connected at the four corners of the upper base plate 310 and lower base plate 330, respectively. The four supporting columns 320 are perpendicular to both the upper base plate 310 and the lower base plate 330. The guide rail 340 consists of two sliding columns, each disposed between the two supporting columns 320, and the sliding columns are perpendicular to both the upper base plate 310 and the lower base plate 330. The upper lifting block 350 and the lower lifting block 360 each include a fixing ring and fixing ears located on both sides of the fixing ring, which are slidably engaged with the two sliding columns. Both the upper lifting block 350 and the lower lifting block 360 can slide up and down along the guide rail 340.

[0056] In this embodiment, the lower lifting block 360 and the upper lifting block 350 can move up and down at a certain speed under the control of a motor, and the specific type and structure of the motor are not limited.

[0057] In one embodiment, such as Figure 6 As shown, the cloth wheel rotating assembly 220 is provided with an upper spiral shaft 500, a lower spiral shaft 510, a top sealing plate 520, a bottom sealing plate 530, and a cloth wheel 540 sleeved on the lower spiral shaft 510. The upper spiral shaft 500 and the lower spiral shaft 510 are coaxial, and the top of the lower spiral shaft 510 is threadedly connected to the bottom of the upper spiral shaft 500.

[0058] The top sealing plate 520 and the bottom sealing plate 530 are fixedly connected to both ends of the lower spiral shaft 510, respectively. The top sealing plate 520 and the bottom sealing plate 530 are both perpendicular to the axis of the lower spiral shaft 510. The distance between the top sealing plate 520 and the bottom sealing plate 530 is equal to the length of the nickel-titanium alloy thick tube to be polished.

[0059] Both the top sealing plate 520 and the bottom sealing plate 530 are circular with equal radii. During polishing, the top sealing plate 520 and the bottom sealing plate 530 can seal the space between the first inner liner 100 or the fixed inner liner 200, preventing the abrasive media or polishing fluid from spilling out. The top sealing plate 520 consists of two semi-circular plates, which are detachably mounted on the lower spiral shaft 510. The composition of the top sealing plate 520 facilitates its assembly and disassembly.

[0060] In this embodiment, the shaft cloth wheel rotating assembly 220 is also provided with fasteners for fixing the two semicircular plates. After the two semicircular plates are assembled onto the lower spiral shaft 510, the semicircular plates are fastened.

[0061] The top end of the lower spiral shaft 510 extends through the top sealing plate 520, and the bottom end of the lower spiral shaft 510 extends through the bottom sealing plate 530. The top end of the lower spiral shaft 510 is for connection with the upper spiral shaft 500, and the bottom end is for connection with the lifting mechanism 300.

[0062] The shaft radius of the cloth wheel 540 is equal to the radius of the top sealing plate 520; the top of the cloth wheel 540 abuts against the bottom of the top sealing plate 520, and the bottom abuts against the top of the bottom sealing plate 530. The upper part of the top sealing plate 520 of the shaft cloth wheel rotating assembly 220 is also provided with a fastening bolt that is sleeved on the lower spiral shaft 510.

[0063] The cloth wheel 540 is a core sponge / cloth polishing wheel with a through-hole metal structure in the core. The cloth wheel 540 can absorb polishing liquid.

[0064] In one embodiment, the cloth wheel rotating assembly 220 further includes a rotary motor component 230 and a grinding auxiliary component 240. The rotary motor component 230 is positioned above the grinding auxiliary component 240 and is fixedly connected to the upper lifting block 350. The grinding auxiliary component 240 is fixedly connected to the lower lifting block 360. The rotation axis of the rotary motor component coincides with the axis of the cloth wheel rotating assembly 220, and the upper spiral shaft 500 of the cloth wheel rotating assembly 220 is fixedly connected to the rotary motor component 230. The rotation of the cloth wheel 540 can be controlled by the rotary motor component 230.

[0065] The grinding auxiliary component 240 is cylindrical, with an inner diameter equal to that of the liner and an outer diameter equal to that of the sleeve 210. The rotary motor component 230 has a circular protrusion at its bottom, and the grinding auxiliary component 240 has a cylindrical assembly cavity with a radius equal to that of the circular protrusion at its top. The circular protrusion is fitted into the assembly cavity. The grinding auxiliary component 240 and the rotary motor component 230 are sealed together via the circular protrusion and the assembly cavity, preventing polishing fluid from spilling out.

[0066] like Figure 7 and Figure 8As shown, the bottom of the grinding auxiliary component 240 abuts against the top of the sleeve 210; a rotating hole is provided at the center of the inner side of the bottom of the sleeve 210, and the bottom end of the lower spiral shaft 510 of the shaft cloth wheel rotating assembly 220 is inserted into the rotating hole; the shaft radius of the circular groove 370 is equal to the shaft radius of the sleeve 210, and two mounting grooves 112 are provided on the outer side of the bottom of the sleeve 210, which can be matched and installed with two mounting keys 380 respectively, and the sleeve 210 is inserted into the circular groove 370; a support ring 211 is provided inside the sleeve 210, and the outer wall of the support ring 211 is fixedly connected to the inner wall of the sleeve 210. The inner diameter of the support ring 211 is equal to the inner diameter of the nickel-titanium alloy thick tube to be polished, and the distance from the bottom of the support ring 211 to the inner side of the bottom of the sleeve 210 is greater than the height of the fixed inner liner 200; the top of the fixed inner liner 200 abuts against the bottom of the grinding auxiliary component 240, and the bottom abuts against the top of the support ring 211.

[0067] Specifically, the space below the support ring 211 inside the sleeve 210 is used to store polishing fluid.

[0068] In a specific embodiment, taking a nickel-titanium alloy coarse tube with an inner diameter of 20 mm, an outer diameter of 21 mm, and a tube length of 1000 mm as an example, the method of using the fine polishing device for the inner wall of the nickel-titanium alloy coarse tube of the present invention is described. Before use, the nickel-titanium alloy coarse tube is first cleaned and dried. The specific method includes the following steps:

[0069] (1) Move the upper lifting block 350 and the lower lifting block 360 to lift the rotary motor component 230 and the grinding auxiliary component 240 upward until the bottom of the cloth wheel 540 is flush with the bottom of the grinding auxiliary component 240 and the distance between the grinding auxiliary component 240 and the sleeve 210 is greater than 1000mm.

[0070] (2) Fill the sleeve 210 with polishing liquid of volume V, where V = π × (R1) 2 -R2 2 )×(H1+H2), where R1 is the outer radius of the lower inner liner 410, R2 is the inner radius of the lower inner liner 410, H1 is the height of the lower inner liner 410, and H2 is the height of the upper inner liner 400.

[0071] (3) Place the nickel-titanium alloy coarse tube to be polished into the fixed inner liner 200, start the air pump, and ensure that the nickel-titanium alloy coarse tube to be polished is adsorbed onto the inner wall of the fixed inner liner 200.

[0072] (4) Move the upper lifting block 350 and the lower lifting block 360 until the bottom end of the lower spiral shaft 510 of the shaft cloth wheel rotating assembly 220 is inserted into the rotating hole, and the bottom of the grinding auxiliary component contacts the top end of the sleeve 210. At this time, the cloth wheel 540 is completely immersed in the polishing liquid.

[0073] (5) Start the rotary motor component 130, control the speed of the spiral blade 540 to 15 revolutions / minute, and continue to rotate for 3 minutes to allow the cloth wheel 540 to completely absorb the polishing liquid;

[0074] (6) Move the lifting block 350 until the bottom of the cloth wheel 540 is flush with the bottom of the fixed lining 200.

[0075] (7) Adjust the rotation speed of the rotary motor component 130 to 150 rpm and rotate continuously for 5 minutes; adjust the rotation speed of the rotary motor component 130 to 15 rpm, move the upper lifting block 350, and after the lower end of the cloth wheel 540 is flush with the lower end of the grinding auxiliary component 240, (do not close the upper lifting block here) move the lower lifting block 360 until the distance between the cloth wheel 540 and the grinding auxiliary component 240 and the sleeve 210 is greater than 1000 mm.

[0076] The above method can effectively remove scratches on the inner wall of nickel-titanium alloy coarse pipes, improve the smoothness of the inner wall, and achieve automated polishing with high efficiency.

[0077] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for fine polishing the inner wall of a nickel-titanium alloy coarse tube, characterized in that, It is equipped with a cylindrical fixed inner liner (200) that can be tightly fitted onto the outside of the nickel-titanium alloy coarse tube to be polished, a sleeve (210) with a closed bottom, and a shaft cloth wheel rotating assembly (220) that can rotate around the axis of the sleeve (210). The sleeve (210) is fitted onto the outside of the fixed inner liner (200), and the shaft cloth wheel rotating assembly (220) is disposed inside the sleeve (210). The axis of the shaft cloth wheel rotating assembly (220) coincides with the axis of the sleeve (210), and the maximum rotating diameter of the shaft cloth wheel rotating assembly (220) is equal to the inner diameter of the nickel-titanium alloy coarse tube to be polished. The height of the fixed inner liner (200) is equal to the length of the nickel-titanium alloy coarse tube to be polished. The fixed inner liner (200) includes an upper inner liner (400) and a lower inner liner (410). The upper inner liner (400) is fixedly connected to the top of the lower inner liner (410). The height ratio of the upper inner liner (400) to the lower inner liner (410) is 1:16~19. The lower liner (410) has a plurality of first through holes (420) uniformly arranged along the axial direction in the middle of the side wall. Each first through hole (420) vertically penetrates the side wall of the lower liner (410). The side wall of the lower liner (410) has a plurality of sets of second through holes (430) in the radial direction, the number of which is equal to the number of first through holes (420). Each set of second through holes (430) includes a plurality of second through holes (430) uniformly distributed in the vertical direction. Each second through hole (430) radially penetrates the side wall of the lower liner (410). Each first through hole (420) is connected to all the second through holes (430) in a set of second through holes (430). The upper inner liner (400) has a grooved ring (440) in the middle of its bottom, and each first through hole (420) is connected to the grooved ring (440); The side wall of the upper liner (400) is provided with a first air extraction hole (450), which is connected to the groove ring (440). The sleeve (210) is provided with a second air extraction hole (460) in the axial direction, and the second air extraction hole (460) is connected to the first air extraction hole (450); An air pump is provided on the outside of the sleeve (210), and the air pump is connected to the second air extraction hole (460); The shaft cloth wheel rotating assembly (220) is provided with an upper spiral shaft (500), a lower spiral shaft (510), a top sealing plate (520), a bottom sealing plate (530), and a cloth wheel (540) sleeved on the lower spiral shaft (510); The upper helical shaft (500) and the lower helical shaft (510) are coaxial, and the top of the lower helical shaft (510) is threadedly connected to the bottom of the upper helical shaft (500). The top sealing plate (520) and the bottom sealing plate (530) are fixedly connected to both ends of the lower spiral shaft (510), respectively. The top sealing plate (520) and the bottom sealing plate (530) are both perpendicular to the axis of the lower spiral shaft (510). The distance between the top sealing plate (520) and the bottom sealing plate (530) is equal to the length of the nickel-titanium alloy coarse tube to be polished. The top sealing plate (520) and the bottom sealing plate (530) are both circular and have the same radius. The top sealing plate (520) is composed of two semi-circular plates, which are detachably assembled to the lower spiral shaft (510). The top end of the lower spiral shaft (510) extends through the top sealing plate (520), and the bottom end of the lower spiral shaft (510) extends through the bottom sealing plate (530). The radius of the cloth wheel (540) is equal to the radius of the top sealing plate (520); The top of the cloth wheel (540) abuts against the bottom of the top sealing plate (520), and the bottom abuts against the top of the bottom sealing plate (530).

2. The fine polishing device for the inner wall of a nickel-titanium alloy coarse tube according to claim 1, characterized in that, The inner wall fine polishing device of the nickel-titanium alloy coarse tube is also provided with a lifting mechanism (300), which is provided with an upper base plate (310), multiple support columns (320), a lower base plate (330), a guide rail (340), an upper lifting block (350) and a lower lifting block (360). The upper substrate (310) and the lower substrate (330) are parallel and aligned vertically and fixedly connected to the upper and lower ends of the plurality of support columns (320), and the guide rail (340) is vertically fixed between the upper substrate (310) and the lower substrate (330). The upper lifting block (350) and the lower lifting block (360) are both sleeved on the guide rail (340) and can slide up and down along the guide rail (340); The bottom substrate (330) has a circular groove (370) on its top, and two mounting keys (380) are horizontally arranged inside the circular groove (370).

3. The fine polishing device for the inner wall of a nickel-titanium alloy coarse tube according to claim 2, characterized in that, The inner wall fine polishing device of the nickel-titanium alloy coarse tube is also provided with a rotary motor component (230) and a grinding auxiliary component (240). The rotary motor component (230) is located above the grinding auxiliary component (240). The rotary motor component (230) is fixedly connected to the upper lifting block (350), and the grinding auxiliary component (240) is fixedly connected to the lower lifting block (360). The rotation axis of the rotary motor component coincides with the axis of the shaft cloth wheel rotation assembly (220). The upper spiral shaft (500) of the shaft cloth wheel rotation assembly (220) is fixedly connected to the rotary motor component (230). The grinding auxiliary component (240) is cylindrical, with an inner diameter equal to the inner diameter of the liner and an outer diameter equal to the outer diameter of the sleeve (210). The rotary motor component (230) has a circular protrusion at its bottom, and the grinding auxiliary component (240) has a columnar assembly cavity with a radius equal to that of the circular protrusion at its top. The circular protrusion is assembled in the assembly cavity. The bottom of the grinding auxiliary component (240) abuts against the top of the sleeve (210); A rotating hole is provided at the center of the inner side of the bottom of the sleeve (210), and the bottom end of the lower spiral shaft (510) of the shaft cloth wheel rotating assembly (220) is inserted into the rotating hole; The axial radius of the circular groove (370) is equal to that of the sleeve (210). Two mounting slots (112) are provided on the outer bottom of the sleeve (210) to be matched with two mounting keys (380) respectively. The sleeve (210) is inserted into the circular groove (370).

4. The fine polishing device for the inner wall of a nickel-titanium alloy coarse tube according to claim 3, characterized in that, The sleeve (210) is provided with a support ring (211) inside. The outer wall of the support ring (211) is fixedly connected to the inner wall of the sleeve (210). The inner diameter of the support ring (211) is equal to the inner diameter of the nickel-titanium alloy tube to be polished. The distance from the bottom of the support ring (211) to the inner side of the bottom of the sleeve (210) is greater than the height of the fixed inner liner (200). The top of the fixed inner liner (200) abuts against the bottom of the grinding auxiliary component (240), and the bottom abuts against the top of the support ring (211).

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